more easily extendable DisplayRegion

panda/src/display/displayRegion.I

@@ -53,8 +53,8 @@ get_dimensions(PN_stdfloat &l, PN_stdfloat &r, PN_stdfloat &b, PN_stdfloat &t) c
   b = cdata->_dimensions[2];
   t = cdata->_dimensions[3];
 }
-///////////////////////////////////////////////////////////////////
 
+///////////////////////////////////////////////////////////////////
 //     Function: DisplayRegion::get_dimensions
 //       Access: Published
 //  Description: Retrieves the coordinates of the DisplayRegion's
@@ -512,6 +512,17 @@ get_draw_region_pcollector() {
   return _draw_region_pcollector;
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: DisplayRegion::pixel_size_changed
+//       Access: Private, Virtual
+//  Description: Called when the size in pixels of this region
+//               has changed.  Also called the first time the
+//               pixel size is known.
+////////////////////////////////////////////////////////////////////
+INLINE void DisplayRegion::
+pixel_size_changed(int x_size, int y_size) {
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DisplayRegion::CDataCull::Constructor
 //       Access: Public

panda/src/display/displayRegion.cxx

@@ -14,6 +14,7 @@
 
 #include "displayRegion.h"
 #include "stereoDisplayRegion.h"
+#include "graphicsEngine.h"
 #include "graphicsOutput.h"
 #include "config_display.h"
 #include "texture.h"
@@ -43,6 +44,8 @@ DisplayRegion(GraphicsOutput *window, const LVecBase4 &dimensions) :
   _draw_buffer_type = window->get_draw_buffer_type();
   set_dimensions(dimensions);
   compute_pixels_all_stages();
+
+  _window->add_display_region(this);
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -738,6 +741,9 @@ do_compute_pixels(int x_size, int y_size, CData *cdata) {
       << "DisplayRegion::do_compute_pixels(" << x_size << ", " << y_size << ")\n";
   }
 
+  int old_w = cdata->_pr - cdata->_pl;
+  int old_h = cdata->_pt - cdata->_pb;
+
   cdata->_pl = int((cdata->_dimensions[0] * x_size) + 0.5);
   cdata->_pr = int((cdata->_dimensions[1] * x_size) + 0.5);
 
@@ -756,6 +762,12 @@ do_compute_pixels(int x_size, int y_size, CData *cdata) {
     cdata->_pbi = int(((1.0f - cdata->_dimensions[2]) * y_size) + 0.5);
     cdata->_pti = int(((1.0f - cdata->_dimensions[3]) * y_size) + 0.5);
   }
+
+  int w = cdata->_pr - cdata->_pl;
+  int h = cdata->_pt - cdata->_pb;
+  if (old_w != w || old_h != h) {
+    pixel_size_changed(w, h);
+  }
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -782,6 +794,19 @@ set_active_index(int index) {
 #endif  // DO_PSTATS
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: DisplayRegion::do_cull
+//       Access: Protected, Virtual
+//  Description: Performs a cull traversal.  The default
+//               implementation simply calls GraphicsEngine::do_cull.
+////////////////////////////////////////////////////////////////////
+void DisplayRegion::
+do_cull(CullHandler *cull_handler, SceneSetup *scene_setup,
+        GraphicsStateGuardian *gsg, Thread *current_thread) {
+
+  GraphicsEngine::do_cull(cull_handler, scene_setup, gsg, current_thread);
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DisplayRegion::CData::Constructor
 //       Access: Public

panda/src/display/displayRegion.h

@@ -162,6 +162,11 @@ private:
   void win_display_regions_changed();
   void do_compute_pixels(int x_size, int y_size, CData *cdata);
   void set_active_index(int index);
+  INLINE virtual void pixel_size_changed(int x_size, int y_size);
+
+protected:
+  virtual void do_cull(CullHandler *cull_handler, SceneSetup *scene_setup,
+                       GraphicsStateGuardian *gsg, Thread *current_thread);
 
 protected:
   // The associated window is a permanent property of the
@@ -261,7 +266,9 @@ public:
 private:
   static TypeHandle _type_handle;
 
+  friend class GraphicsEngine;
   friend class GraphicsOutput;
+  friend class DisplayRegionCullCallbackData;
   friend class DisplayRegionPipelineReader;
 };
 

panda/src/display/displayRegionCullCallbackData.cxx

@@ -60,7 +60,5 @@ upcall() {
   DisplayRegion *dr = _scene_setup->get_display_region();
   GraphicsStateGuardian *gsg = dr->get_window()->get_gsg();
 
-  GraphicsEngine::do_cull(_cull_handler, _scene_setup,
-                          gsg, current_thread);
+  dr->do_cull(_cull_handler, _scene_setup, gsg, current_thread);
 }
-

panda/src/display/graphicsEngine.cxx

@@ -1103,6 +1103,7 @@ texture_uploaded(Texture *tex) {
   LoadedTexture &lt = _loaded_textures.back();
   lt._tex = tex;
   lt._image_modified = tex->get_image_modified();
+//               Usually only called by DisplayRegion::do_cull.
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -1334,7 +1335,7 @@ cull_and_draw_together(GraphicsOutput *win, DisplayRegion *dr,
         
       } else {
         // Perform the cull normally.
-        do_cull(&cull_handler, scene_setup, gsg, current_thread);
+        dr->do_cull(&cull_handler, scene_setup, gsg, current_thread);
       }
 
       gsg->end_scene();
@@ -1452,7 +1453,7 @@ cull_to_bins(GraphicsOutput *win, DisplayRegion *dr, Thread *current_thread) {
 
     } else {
       // Perform the cull normally.
-      do_cull(&cull_handler, scene_setup, gsg, current_thread);
+      dr->do_cull(&cull_handler, scene_setup, gsg, current_thread);
     }
 
     PStatTimer timer(_cull_sort_pcollector, current_thread);

panda/src/display/graphicsOutput.cxx

@@ -671,7 +671,7 @@ make_mono_display_region(const LVecBase4 &dimensions) {
     return dr;
   }
 
-  return add_display_region(new DisplayRegion(this, dimensions));
+  return new DisplayRegion(this, dimensions);
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -720,9 +720,6 @@ make_stereo_display_region(const LVecBase4 &dimensions) {
 
   PT(StereoDisplayRegion) stereo = new StereoDisplayRegion(this, dimensions,
                                                            left, right);
-  add_display_region(stereo);
-  add_display_region(left);
-  add_display_region(right);
 
   return stereo;
 }
@@ -1592,7 +1589,7 @@ create_texture_card_vdata(int x, int y) {
 ////////////////////////////////////////////////////////////////////
 //     Function: GraphicsOutput::add_display_region
 //       Access: Private
-//  Description: Called by one of the make_display_region() methods to
+//  Description: Called by the DisplayRegion constructor to
 //               add the new DisplayRegion to the list.
 ////////////////////////////////////////////////////////////////////
 DisplayRegion *GraphicsOutput::